Choi BC, Belov M, Hiebert WK, Ballentine GE, Freeman MR. Ultrafast magnetization reversal dynamics investigated by time domain imaging.
Phys Rev Lett 2001;
86:728-731. [PMID:
11177923 DOI:
10.1103/physrevlett.86.728]
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Abstract
Spatiotemporal magnetization reversal dynamics in a Ni(80)Fe(20) microstructure is studied using ps time scale scanning Kerr microscopy. Time domain images reveal a striking change in the reversal associated with the reduction in switching time when a transverse bias field is applied. Magnetization oscillations subsequent to reversal are observed at two resonance frequencies, which sensitively depend on the bias field strength. The oscillation at f = 2 GHz is caused by the damped precession of M, while the lower frequency approximately 0.8 GHz mode is interpreted in terms of domain wall oscillation.
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